Power plant for vibrating screens



Jan. 9, 1945,

L. G. SYMONS POWER PLANT FOR VIBRATING SCREENS A'ymw Filed Jan. 10. 1941 Jan. 9, 1945.

L. s. SYMONS 2,367,070

POWER PLANT FOR VIBRATING SCREENS Fiied Jan. 10, 1941 4 Sheets-Sheet 2 lore)? fluff/r2422;

Jan. 9, 1945.

L G SYMONS POWER PLANT FOR VIBRATING SCREENS Filed Jan. 10, .1941

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Patented Jan. 9, 1945 Nordberg Manufacturing Company, Milwaukee, Wis., a corporation of Wisconsin Application January li), 1941, Serial No. 373,897

2 Claims.

My invention relates to an improvement in screens and has for one purpose the provision of an improved vibrating or driving mechanism for vibrating a screen.

Another purpose is the provision of a driving or vibrating mechanism for a screen which shall have a minimum of bearings and wearing parts. Another purpose is the provision of an improved vibrating mechanism for such screens in which the vibration is imparted in response to the rectilinear movement of a vibrated weight.

' Another purpose is the provision of an improved weight and drive therefor adapted to impart to such a weight on the screen a rectilinear move ment in response to a rotary movementof a driving pulley.

Another purpose is the provision of an improved vibrating means for screens in which a relatively small weight is imparted a rectilinear movement of substantial length.

Other purposes will appear from time to time in the course ofthe specification and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawings wherein:

Fig. 1 is a side elevation;

Fig. 2 is a plan view;

Fig. 3 is a section on the line 3-3 of Fig. 1;

Fig. 4 is a section on the line 4- -4 of Fig. 3; and

Figs. 5, 6 and 7 are more or less diagrammatic illustrations of the position of the weight at various points in its path.

Like parts are indicated by like symbols throughout the specification and drawings. Referring to the drawings, l indicates any suitable base upon which the screen is mounted. '1 illustrate a base frame which may include longitudinally extending parallel channel elements 2, 2. These channel elements may be connected by any suitable transversely extending end frame members or angles 3 and intermediate transversely extending angles 4. intermediate frame elements and the left end members 3, referring to Fig. 1, are tilted somewhat from the horizontal, as shown for example in Fig, 1.

Vibratably mounted upon this base frame is any suitable deck, which may include for example parallel side plates 5, 5, which may be connected by transversely extending frame members 6, which in turn may be welded to side-plates l,

which side plates may be bolted or 'otherwisese cured to the side frame members 5, as by bolts 8 l0, l0 indicate transversely extend- It will be observed that the mg reinforcing plates interposed between the side plates 5 and the plates 1.

Referring for example to Fig. 1, the plates may be of suflicient length to carry a plurality of the transverse members 6, whereas in the lower part of the deck I illustrate shorter plates 1, each of which is shown as carrying a single transverse member 6. It will be understood, however, that this is a matter of detail and may be varied to suit conditions. Supported upon the transverse members 6 are screens I8, which may be secured in any suitable fashion to the deck structure.

In order to mount the deck for vibration upon the base, I may employ any suitable support ng link structure. I illustrate herein-a supporting link structure at each end. Referring to Fig. 1,.

I illustrate inclined transversely extending angles 4. It is understood that there is a separate link structure at each end of the screen. The link structure proper is shown as including a bottom channel or abutment 40, mounted on one of the members 4 and formed to receive the transversely extending rubber pad 4|, which may be in one or more sections, but which .preferably extends transversely substantially or entirely across the width of the deck.

43 is an intermediate web or compression member which carrlesat its lower end the channel 44 and at its upper end the channel 45. The lower channel 44 engages the upper portion of the rubber block 4|. The upper channel 45 engages the lower portion of a similar rubber block 46, the upper portion of which in turn is engaged by a channel 41, which is secured to any suitable member, such as the transversely extending deck frame member 48. Any suitable means may be employed for holding the deck down upon the base and for constraining the deck to a vibratory movement, which may be described as having a uniform radius. I illustrate for example compression bolts 49, headed at each end as at 50, 50a. The lower ends may pass, for

, faces of the members 5|, 52, respectively. Any

suitable compression may be put upon the said compression members. It will be understood, of course, that the apertures through which the bolts 48 pass are of sufficient width to compensate for vibratory movement of the screen deck and to prevent a metal to metal contact.

I also provide means for normally tending to hold the screen in a predetermined neutral position, which preferably is a position in which the link structure, including the web 48, is generally perpendicular to the engaged faces of the members l and 8a. Such means may, for example, include a plurality of springs 55 mounted on the bolts 58, having end washers 51, the upper ends of the bolts passing through a web 58 on the member 5! and through a web 59 on the end member 8. It will be understood that the springs 55 resist the gravital tendency of the deck to tilt the members 43, and in effect push the deck against gravity into its predetermined neutral position, which is shown for example in Fig. 1.

Any suitable means for feeding material to the feed end of the screen may be employed. I illustrate for example a feed chute 80 with a feed limit plate 8|. Any other suitable feeding means may be employed, and it will be understood that, if desired, the material may be fed simultaneously to the upper and lower deck, although such disposition is not shown in Fig. 1.

In order to vibrate the screen I illustrate the following structure: Mounted upon the base is an upwardly extending frame structure, which may include for example the vertical frame element '83, the inclined element 84, the motor base 85, secured to the top thereof, the motor 86, and the drive pulley 81 thereof. As shown in Fig. 2, the

motor is at one .side of the screen structure, and

the above described support may be stabilized or held in position by the transversely extending pipe 88, the far end of which extends down to the opposite base frame element, as at 88.

As shown for example in Fig. 1, the side plates 5 have an edge 5a, which inclines upwardly toward the below described power plant. Any suitable reinforcing channel or the like may be employed, as at 10. Connecting the two side plates 8 I illustrate a housing structure, which-includes a centrally located,tube or tubular housing 1|. Fitted upon each end thereof is an annular housing member, generally indicated as 12, 18, each of which has a flange 14, which may be bolted or otherwise secured to the side plates 5. It will be noted from Fig. 3 that the members 12, 13 include inwardly extending cylindrical portions 15, which are secured to the tubular housing by means of bolts 18. The flange or plate 14 of the member 13 carries an outwardly extending cylindrical portion 11, which may be closed for example by a cap or plate 18. The flange 14 of the member 12, which is adjacent or aligned with the motor 68, has an inwardly extending bearing sleeve 19. The open end of the sleeve is partially closed by a plate or ring 18a, which is grooved to cooperate with a dust sealing member 18b.

80 illustrates a driven pulley, which may be driven from the motor pulley 61 by any suitable belt or belts 8|. The pulley 80 is secured to a rotor shaft generally indicated as 82, mounted in any suitable bearings 88 and having at its inner end a plate 88 which may be generally circular.-

At the opposite side of the deck is a shaft 85 in bearings 88, which also has a plate 81. The plates 84 and 81 are connected for example by the crescent shaped member 88. Mounted within or forming part of the tubular housing 1| is the internally toothed ring gear 88. This is fixed in relation to the deck and the tube 1|.

Mounted on the plates 84 and 81 are bearings 88, 8!, which receive aligned coaxial shafts d2, 88. These shafts are provided with oflset or crank portions 84, 88, between which extends any suitable weight 88. 81 is a pinion mounted on or forming part of the shaft 82 and in mesh with the internal ringgear 88. The center of the weight 88 is preferably aligned with the pitch line of the teeth of said pinion 81. As will be clear from Fig. 4, the diameter of the pinion 81 is one-half the diameter of the ring gear 88. The result is that, in response to rotation of the pulley 80, the weight 88 oscillates along a rectilinear path through the various positions shown diagrammatically in Figs. 4, 5, 6 and 'I. In other words, although the weight 88 rotates about the center of the shafts 82 and 88, this center rotates about the centerof the ring gear 88, and the result is thateach tooth of the gear 81 oscillates along a rectilinear path, and from this it results that the weight, which is aligned wlththe pitch line of the teeth, also oscillates through a rectilinear path.,

The support 88 is so formed as to permit the weight to clear at all positions, and it will be understood that the support 88 and the plates 84 and 81 rotate in a counterclockwise direction, referring to the position of the parts in Figs. to 7, while the gear 81 rotates in a clockwise direction about its center.

It will be realized that, whereas I have described and illustrated a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting me to my precise showing.

.The use and operation of my invention are as follows:

I illustrate a singularly simple vibrating means for vibratory screens. The deck may be mounted in any suitable supports, and the above described flexible supports are merely representative and not restrictive, as the deck may be mounted on springs, rods, or other supporting means.

The linear movement of the Weight is obtained by having the center of the weight 96 coincide with the pitch line of the gear 81. Thus a relatively small weight can be given rectilinear movement of substantial amplitude, this movement resulting from the rotation of the gear 91 in relation to the fixed internal toothed gear 88. The weight 88 is so mounted that it is free to rotate and clears the support 88.

When the rotor is rotated in one direction the weight through the gear and pinion connection above described rotates in the opposite direction, the parts being so proportioned that the center of the weight, instead of rotating, moves rectilinearly while the weight itself rotates. The weight moves in one direction, and the reaction of the movement of the weight causes the deck to move in the opposite direction along the same general path. The deck responds to the reaction pressure of the movement of the weight along its linear path, and the deck also takes up a linear vibration along the same path but in an opposite direction, and with a much smaller amplitude of movement than the weight. -The parts may be so proportioned as to give, within a reasonable range, any desired amplitude of vibration of the deck, by increasing or decreasing the mass of the weight. It will be understood that any suitable means may be-employed for changing the mass of the weight. Whereas r have illustrated a unitary weight structure, it

will be understood, of couIse that the weight may be made removable, so that other weights 1. In combination, a screen member, having side frameelements; means for supporting it andfor constraining it to' generally linear vibratory movement and means for imparting to it a linear -'vibration parallel with the linear movement to which it'is constrained, including an internal circumferentiafgear fixed on said screen member, arotor and means for rotating it aboutvan axis concentric with said internal gear, said rotor including end elements located adjacent each of tion between said end elements, a sub rotor rotatably mounted'onv said end. elements for rotation about an axis parallel with but eccentric to the axis ofrotation of the rotor, said sub rotor having stub shafts at each end, in bearing relationthe opposite side frame elements, a fixed connecship each with one of the end members of the first mentioned rotor, aplanetary gear associ-, 1 ated :with one or said stub shafts and in mesh' with the internal gear,'said stub shafts being connected by an offset weight member, the center of mass of which is eccentric to the center of rotation of the stub shafts, the connection between the end members of the main rotor being located out of the path of movement ofsaid weight.-

2. -In combination, a screen deck having opposite side frame elements, a base upon which said screen deck is vibratably mounted and means for vibrating said screen deckincludin'g a rotor and means for rotating it, said rotor having a stub shaft at each end, and bearing meansfor each of said stubshafts mounted on one 'of said side frame members, -end elements associated with each stub shaft, a fixed eccentric connection extending between said end elements, a sub-rotor including a stub shaft in bearing relationship with each of said end members, said-stub shafts being connected by a weight having 'a' substan-" tially longitudinal extension perpendicular to the direction of movement of the material along the screen, the center of said weight being eccentric to the axis of said sub-rotor, the axis of said subrotor being parallel with but eccentric to the axis of the main rotor, a circumferential interior ring gear, fixed 'in relation to the screendeck, and concentric with the axis of rotation of the main rotor, surrounding said main and sub rotor, a planetary gearfixed'on said sub-rotor and concentric therewith, in mesh with said internal gear, the fixed eccentric connection between' the end members of the main rotor being located out of the path of movement of said weight. LOREN G. ,SYMONS. 

